The transiting dust clouds that orbit the white dwarf J0328-1219 are devoid of small particles (< 0.1 micron). Observations show that fade amount doesn't depend on wavelength. This finding resembles a similar observation for white dwarf WD 1145+017, but the explanations for an absence of small particles in the two white dwarf systems may differ due to their different distances from the star.
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Gary et al. (2024) studied this question.
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